linux-kernel - Re: [PATCH 09/16] kdump: Hook emergency_virt

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Message-ID: <20081105144144.GC8993@redhat.com>
Date:	Wed, 5 Nov 2008 09:41:44 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Eduardo Habkost <ehabkost@...hat.com>
Cc:	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Simon Horman <horms@...ge.net.au>,
	Andrew Morton <akpm@...l.org>, Haren Myneni <hbabu@...ibm.com>,
	Andrey Borzenkov <arvidjaar@...l.ru>, mingo@...hat.com,
	"Rafael J. Wysocki" <rjw@...k.pl>, kexec@...ts.infradead.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/16] kdump: Hook emergency_virt_disable() on crash
	shutdown code

On Tue, Nov 04, 2008 at 12:52:37PM -0200, Eduardo Habkost wrote:
> Signed-off-by: Eduardo Habkost <ehabkost@...hat.com>
> ---
>  arch/x86/kernel/crash.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
> index d84a852..87780ba 100644
> --- a/arch/x86/kernel/crash.c
> +++ b/arch/x86/kernel/crash.c
> @@ -26,6 +26,7 @@
>  #include <linux/kdebug.h>
>  #include <asm/smp.h>
>  #include <asm/reboot.h>
> +#include <asm/virtext.h>
>  
>  #include <mach_ipi.h>
>  
> @@ -49,6 +50,7 @@ static void kdump_nmi_callback(int cpu, struct die_args *args)
>  #endif
>  	crash_save_cpu(regs, cpu);
>  
> +	emergency_virt_disable();
>  	disable_local_APIC();
>  }
>  
> @@ -80,6 +82,7 @@ void native_machine_crash_shutdown(struct pt_regs *regs)
>  	local_irq_disable();
>  
>  	kdump_nmi_shootdown_cpus();
> +	emergency_virt_disable();

Hi Eduardo,

It might be a good idea to put a 2-3 line comment saying why it is
imporatant to disable virtualization here before we continue.

Thanks
Vivek
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